From 5b10f96793ab6f3a4ef446d67c09ea91b7898584 Mon Sep 17 00:00:00 2001
From: Marc Chevrier <marc.chevrier@gmail.com>
Date: Wed, 23 Sep 2020 18:06:35 +0200
Subject: [PATCH] Linux: Compile with _FILE_OFFSET_BITS=64 on 32-bit Linux

To avoid problems accessing filesystem, use 64-bit file offsets when
compilation model is 32-bit.  This explicit definition is needed now
that KWSys does not provide LFS settings in its headers anymore.

Fixes: #20568
---
 CompileFlags.cmake | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CompileFlags.cmake b/CompileFlags.cmake
index 053259f47c..1c5f1beca9 100644
--- a/CompileFlags.cmake
+++ b/CompileFlags.cmake
@@ -53,6 +53,12 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "^parisc")
   endif()
 endif()
 
+# Use 64-bit off_t on 32-bit Linux
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  # ensure 64bit offsets are used for filesystem accesses for 32bit compilation
+  add_definitions(-D_FILE_OFFSET_BITS=64)
+endif()
+
 # Workaround for TOC Overflow on ppc64
 set(bigTocFlag "")
 if(CMAKE_SYSTEM_NAME STREQUAL "AIX" AND
-- 
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